adding packages

deprecated/file_access/lib/src/pick_file/io.dart

@@ -0,0 +1,92 @@
+import 'package:file_access/file_access.dart';
+import 'package:file_access/src/constants.dart';
+import 'package:file_chooser/file_chooser.dart';
+
+import 'dart:io';
+
+import 'package:file_picker/file_picker.dart';
+import 'package:image_picker/image_picker.dart';
+
+Future<FileX> openFile() async {
+  final _files = await _open(false, false);
+  if (_files == null) return null;
+  return _files.first;
+}
+
+Future<List<FileX>> openFiles() async {
+  final _files = await _open(true, false);
+  if (_files == null) return null;
+  return _files;
+}
+
+Future<FileX> pickImage() async {
+  if (Platform.isIOS || Platform.isAndroid) {
+    var selection = await ImagePicker.pickImage(source: ImageSource.gallery);
+    return _add(selection);
+  }
+  final _files = await _open(false, false, allowedTypes: [
+    FileTypeFilterGroup(
+      label: 'image',
+      fileExtensions: kImageExtensions,
+    ),
+  ]);
+  if (_files == null || _files.isEmpty) return null;
+  return _files.first;
+}
+
+Future<FileX> pickVideo() async {
+  if (Platform.isIOS || Platform.isAndroid) {
+    var selection = await ImagePicker.pickVideo(source: ImageSource.gallery);
+    return _add(selection);
+  }
+  final _files = await _open(false, false, allowedTypes: [
+    FileTypeFilterGroup(
+      label: 'video',
+      fileExtensions: kVideoExtensions,
+    ),
+  ]);
+  if (_files == null || _files.isEmpty) return null;
+  return _files.first;
+}
+
+Future<List<FileX>> _open(bool multiple, bool folders,
+    {List<FileTypeFilterGroup> allowedTypes}) async {
+  if (Platform.isMacOS || Platform.isLinux || Platform.isWindows) {
+    final results = await showOpenPanel(
+      allowedFileTypes: allowedTypes,
+      canSelectDirectories: folders,
+      allowsMultipleSelection: multiple,
+    );
+    if (results.canceled) return null;
+    final List<FileX> _files = [];
+    for (final item in results.paths) {
+      _files.add(await _add(File(item)));
+    }
+    return _files;
+  }
+  if (Platform.isIOS || Platform.isAndroid) {
+    final List<FileX> _files = [];
+    if (multiple) {
+      List<File> files = await FilePicker.getMultiFile();
+      if (files == null) return null;
+      for (final file in files) {
+        _files.add(await _add(file));
+      }
+    } else {
+      File file = await FilePicker.getFile();
+      if (file == null) return null;
+      _files.add(await _add(file));
+    }
+    return _files;
+  }
+  return null;
+}
+
+Future<FileX> _add(File file) async {
+  try {
+    final _base = FileX(file.path);
+    final _bytes = await file.readAsBytes();
+    return await _base.writeAsBytes(_bytes);
+  } catch (e) {}
+  return null;
+}